Balancing the Load Cells Balancing the Load Cells
CubiScan 25 Service Manual 24
7. To balance the load cells you will need to adjust the
variable resistors, which are also known as
potentiometers or POTs. To adjust a POT, use the
small flathead screwdriver to rotate the screw. See
Figure 14.
Rotating a POT clockwise will increase the added
weight from a load cell.
Rotating a POT counterclockwise will decrease the
added weight from a load cell.
Adjusting a POT will affect the other 3 POT readings.
The goal is to have all four corners display the same
value.
8. Place the 15 lb weight on each corner of the CubiScan
25. Record all four values. Figure 15 shows which
CubiScan 25 corner (where the load cells are located)
corresponds with each POT.
9. Choose the two corners that are closest to 15 lb.
These will be your first and second corners. Move the
weight back and forth between them. Adjust the
appropriate POT until the displayed weight values
for both corners are the same (this does not
necessarily need to be exactly 15 lb).
10. Choose your third corner. Move the weight back and
forth between corners one and three. Adjust the
POTs until the same weight value is displayed for all
three of your selected corners.
11. Now move the weight to the fourth corner. Move the
weight back and forth between corners one and four.
Adjust the POT for corner four until the displayed
weight values are the same for each corner.
12. When all four corners read approximately the same
weight, the load cells are balanced.
13. Temporarily remove the glass platform.
14. Replace the load cell summing box lid and secure it
using the screws from step 5.
15. Replace the glass platform.
Figure 15
Load Cell Wire Connections
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